IBM Numeric Keypad for IBM PS/2 L40SX

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Admiral Shark's Keyboards (CC BY-NC-SA 4.0)

1991 Q2 Model M3 Numeric Keypad IBM buckling rubber sleeves (M3/M4 rod-actuated type)More info on this keyboard

eg, P/Ns 1396199, 1396571, 1396572, 1396573, 1396574

IBM-made 17-key numeric keypad option for the IBM 8543 PS/2 L40SX portable computer. It was the first discrete (not integrated into a larger system) device to use IBM buckling sleeve key-switches. It had a modular 8P8C to PS/2-like plug cable with a special pinout, a passthrough port for a PS/2 mouse and a hinged but removable cover.